Sound-transmitting apparatus.



F. STEVENS.

SOUND TRANSMITTING APPARATUS.

APPLICATION man ml. 11 nan 1,27 3, 1 07. Patented July 16, 1918.

2 means for FRANK STEVENS, 0F PHILADELPHIA, PENNSYLVANIA.

SOUND-TRANSMITTING APPARATUS.

Specification of Letters Patent.

Patented July 16, 1918.

Application filed January 17, 1911. Serial mi. 142,921.

vented a new and useful Sound-Tmusniitting Apparatus. of which thefollowing is a specification.

My invention relates to improvements in means for transmitting allsounds, vocal, in

strtuuental, etc, of whatsoever nature, reproduced by artificial meanssuch as phonw graphs. talking vtnaehines and the llhL. and its use inconjunction with such devi es atfouls ready facility for reproducing thesounds therefrom at wid ly separated points and at a distance, withgreat elearne: and fidelity and in satisfactory volume.

My principal object is to provide ellir-ient receiving and confining thesounds referred to and instantly transmitting them to diversdistributing stations, as

for instance. where it is desired to use a talking machine as an adjun tto a moving picture apparatus, my device is useful in taking andtransmitting to an auditorium, long continued records requiring morethan one disk or cylinder. as will more fully appear, together withother novel and useful objects, as the description proceeds.

I attain these objects by the meclutnism illustrated in the accompanyingdrawings, in \\'lll(fl1-' Figure l. a plan view of the device;

Fig. 2. a similar view with the top, B, re-

moved; Fig. 3, a rear elevation 'ith the hack wall, B and someunderlying parts partially broken away to show interior construction;Fig. 4, a plan view of a modified 40 folllt; and. Fig. a side elevationof the same. having a-side removed and parts broken away to showinterior construction. It is to he noted that the wiring shown merelydiagramnu tic, to indicate the mode of conducting the circuits to theexterior of s ope of my invention to he one in which it is shown coupledwith a talking machine having two turn tables-(0r Inandrels) whichalternately engage cpa rate records so as to permit of the use of anindefinite numformance. I have shown such an arrangement. itt l igs. l.g! and 3, although it is to he understood that I do not intend to thusrestrict my invention to such limited use. As shown in Figs. 4 and 5,the sound conducting arms (f, (K may be rotated so as to engagesx'parate talking machines and, it is self-evident from the severalviews without additional specific illustration, that the numher andarrangement of these arms may be increased and varied to engage severalsingle nuu'hines, or one or more machines employing several reprodueerseach. Therefore. for the purpose of illustrating my invention. I haveshown in the accompanying drawings the form thereof which is, at presentpreferred by me, although it is to be understood that the variousinstrumentalities of hich my invention consists can be va- I'ioltslvarranged and organized an lt-hat my invention is not to he limited tothe precise arrangement atul organization as shown and described andthat I reserve the right to reorganize and rearrange theseinstrumentalities within the scope of my invention.

Referring to Figs. 1. 2 and 3,b0 a continuously operating talkingmachine, A, provided with two reprodueers (not shown) is attached mydevice, B, as indicated at 2, having interposed between all adjacentparts of the two machines a shield of rubher or other suitable material,1, to (leaden the. ell'ect of all mechanical sounds and vilu-atious whih might otherwise interfere with and tuar the clearness of the desiredsounds entering through the arms, C, C, which communicate with thereproduccrs 0f the tall zing machine. y Y

The instrument 1'3 is a substantially airtight and sound-proofreceptacle having no openings except those provided for the entrance ofthe reproduced sounds shown in hroken lines at'3 in Figs. 3 and and is'n'eferalily composed of vulcanized fiber which material greatly adds tothe sound )roof uality as well as aff rding insula ion irom chanceelectrical disturbances and presenting a very elegant means for locatingas desired the conductors frotn.\\'ithin to the exterior. To eachopening 3, an arm, C, C, is articulated in such manner-as to make asubstantially sound proof andair-tight joint. yet susceptible of suchsmooth and easy motion as may be required to permit Tliese 65 her, andthus to atforda continuous per- 0f the proper action of the arm.

sound entrances 3, lead to an interior chamber 13", l'orn'ied by thecontinuous ringshaped wall 12, the top, ll, and bottom. It", of the casThis annular wall is made of sound reflecting material and is lirnilyheld between the top and bottom. lntcrposed between this wall's upperedge and the top,

B, is a gasket 13, of material such as rubher or leather, adapted toform a tightly sealed joint, and a similar scaling member 14 is likewisedisposed between the walls lower edge and the bottom B. These gaskets,l3 and 14, are shown as an integral part of the secondary or enscalingwall, l5, which is composed of the same material as the gaskets andwhich surrounds the innermost wall, 12, and it is so disposed paralleltherewith as to form a narrow air-space ll, all around between the two.

\Vithin the sealed chamber, 15", tlms provided, are suitably located oneor more magnetic electric sound transmitters, such as are used ontelephones, adapted to be inliucnccd by the sounds entering, as alreadydescribed through the arms, C, U, and provided with the usual conductors5, which are electrically connected with the bus bars, 16, suitablysecured to the outside of one of the walls (the rear wall, B", in thiscase, Fig. 3) of the case B, by metallic bolts 19, which penetrate thefiber walldind are held by nuts :20, which present contacts for thesecuring of the conductors. Such external leads or conductors as may berequired for any particular result are, of course, attached to these hasbars whereby, the sounds from the transmitters may be led to diversplaces Without re ard to distance, location or number and herereproduced in the usual way.

norder to accurately adjust the transl initter to the exact location,with relation to the arms, C, C, necessary to produce the clearestresults, each transmitter is slidably mounted on a rotatable carrier 6.Each carrier is pivotally secured to the case B by means of a threadedstem 7 whereby the carrier 6 may be rotated and set at any angle and atany desired distance from the wall andthere securely clamped by nuts 17and '18, one within and the other without the wall, and reinforced by.the locking nut 8. Slots 9 are formed on each carrier 6 to engo osuitable guides 10 on each transmitter, catgi ide being provided with aset screw 11. y this construction each transmitter 0 and C may be fittedto the case B, that the number of transmitters may be accordinglv varicdand that my apparatus may be l'l|l|JlU \'i'tl with equal facility inconjunction with one lallting machine. or with several.

liming thus explained the nature of my invention and (lt t'l'l l\tltlll(l shown a way of constructin; theszunc. although without attemptingto et. forth all the forms in which it may be made, or all the modes ofits use, what I do claim is l. in a |lc\ ice of the character described,in combination with t talking machine, a sound chamber attached thereto,interme dialc means to exclude the transmission of nu-chanical soundsand vibrations to said chamber, sound conducting means between saidchamber and the rcproducer on said talking machine, transmitters forrecording and reproducing sound waves within said chamber, andconductors from the transmitters to the exterior of said chamber.

In a device of the character described, in combination with a talking mahine, a sound chamber attached thereto, intermediate means to preventthe transmission of mechanical sounds and vibrations to said chamber,sound conducting means between said chamber and the reproducer on saidtalking machine, transmitters for reeordin and reproducing sound waveswithin salt chamber, means to alter and adjust the locations of saidtransmitters, and conductors from said transmitters to the exterior ofsaid chamber.

3. A device of the character described, comprising a sound-proof andair-tight chamber, a fiber casing therefor, means for introduclngtherein sounds produced by a talking machine, a transmitter forrecording and reproducing sound waves therein, means for adjusting thelocation of said transmitter, and conductors from said transmitter tothe exteriorbf said casing.

4. A device of the character described, comprising a sound-proof andair-tight chamber having curvilinear walls, means for introducing intosaid chamber sounds produced by a talking machine, a transmitter forrecording and reproducing sound waves Within said chamber, means 'foradjusting the location of said transmitter, and conductors from saidtransmitter to the exterior of said chamber.

5. A device of the character described, comprisin a sound-proof anoair-tight chamber aving curvilinear Walls, :1 fiber casin therefor,means for introducing therein sounds produced by a talking machine, atransmltter for recording and reproducing sound waves therein, means foradjustin the location of said transmitter, and con actors from saidtransmitter to the exterior of said casing.

6. A. device of the character described, comprising a sound-proof andair'tight chamber, means for introducinginto said chamber soundsproduced by a talking machine, a transmitter for recording andreiroducing sound waves within said chamr,meuns for adjusting thelocation of said transmitter, conductors from said transmitter to theexterior of said chanr her, and means to exclude mechanical sounds andvibrations from said chamber.

7. A device of the character described comprising a sound-proof andair-tight chamber having curvilinear ails, means for introducing intosaid chambcr sounds produced by a talking machine, a transmitter forrecording and reproducing sound waves within said chamber, means foradjusting the location thereof, conductors thewfrom to the exterior ofsaid chamber, and means to exclude mechanical sounds and vibrations fromsaid chamber.

8. A device of the character described comprising a sound-proof andair-tight chamber having curvilinear walls, a fiber casin therefor,means for introdu ing therein sounds produced by a talking machine, atransmitter for recording: and reproducing sound waves therein, meansfor adjusting the location of said transmitter. conductors therefrom tothe exterior of said casing, and means to exclude mechanical sounds andvibrations from the interior of said casing.

9. A device of the character described, comprising a sound-proof andair-tight chamber having double walls composed of an inner wall of soundreflecting material and a secondary wall of sound deadening material, anair spam between said \alls, means for introducing into said chambersound produced by a talking machine, a transmitter for recording andreproducing sound waves within said chamber, means for adjusting thelocation of said transmitter, conductors from said transmitter to theexterior of said chamber, and means to exclude mechanical sounds andvibrations from said chamber.

10. A device of the character described comprising a sound-proof andair-tight chamber having double walls composed of an inner wall 0{ soundreflecting material and a secondary wall of sound deadening material, anair space between said walls, a.

fiber casing for said chamber, means or introducing into said chambersounds produced by a talking machine, a transmitter for recording andreproducing sound waves within said chamber, means for adjusting thelocation thereof, and conductors there-- from to the exterior of saidchamber.

11. A device of the character described comprising a sound-proot andair-tight; chamber, means for introducing therein sounds produced by atalkin machine, a transmitter for recording an reproducing sound waveswithin said chamber, a fiber housing inclosing said chamber, has bars onthe exterior of said housing, and electrical conductors from saidtransmitter to said bus bars.

12. A device. of the'character described, comprisin a sound-proof andair-tight chamber having double curvilinear walls composed of an innerwall, a secondary wall surrounding the same, an air space between saidwalls, a fiber casing for said chamber, means for introducing into saidchamber sounds produced by a talking machine, a transmitter forrecording and reproducing sound waves within said chamber, bus bars onthe exterior of said casing, and elcctri' cal conductors from saidtransmitters to said bus bars.

13. A device of the character described comprising a soundproof andair-tight chamber composed of an outside casing, an intermediatecurvilinear wall, an innermost curvilinear wait, an air )acc betweensaid casing and said intermediate wall and, an air space between saidinterim-diate and said innermost walls, orifices in said cas ing adaptedto permit of the air-tight and movably fitting of tone arms from a taling machine, transmitters for recording and reproducing sound waves adustably disposed within said chamber, bus ars on the exterior of saidcasing, electrical connections between said transmitters and said busbars, and a rubber shield on the surface of said casing.

FRANK STEVENS.

Witnesses:

ALBERT-SBEVRAY, LILY T. MARTIN.

